Tweaking the audio performance Rpi3

[Frost_dk]

[dynobot]

Good info thanks!

Since graphics is not a priority you might want to turn gpu_mem down to 16 ie gpu_mem=16.

[dynobot]

BTW there are a few more kernel adjustments that should/could be made that are not included with the Rune sound profiles.

Usually I pick one of the profiles and comment out everything then put my own kernel mods in place.

For example here I used ACX's profile and put my tweaks in place
# mod1
if [ "$1" == "ACX" ]; then
echo -n performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ifconfig eth0 mtu 9000
echo noop > /sys/block/mmcblk0/queue/scheduler
echo 0 > /proc/sys/vm/swappiness
echo 1000000 > /proc/sys/kernel/sched_latency_ns
echo 100000 > /proc/sys/kernel/sched_min_granularity_ns
echo 25000 > /proc/sys/kernel/sched_wakeup_granularity_ns
echo 1 > /proc/sys/kernel/hung_task_check_count
echo 20 > /proc/sys/vm/stat_interval
echo -1 > /proc/sys/kernel/sched_rt_runtime_us
echo 5 > /proc/sys/vm/dirty_background_ratio

I also increased the priority of the audio threads in the same file as well as putting MPD on its own core, under the Common Start up section.

renice 19 $(pidof nmbd)
taskset -c -p 1 $(pidof mpd)
renice -10 -p 3
renice -10 -p 12
renice -10 -p 16
renice -10 -p 20

Recently I've been looking at more 'hardware' tweaks

[Frost_dk]

Hi Dynobot.
Thanks a lot for your tweaks.. I will try them right away
Does the pidof nmbd do anything if im not using a samba share?
is it too much to ask for a explanation of the kernel optimizations you made? Just so I kan play with it myself.
Thanks in advance


Kind regards,
Rune Frost

[dynobot]

Hi Frost,

Not sure what you mean by pidof nmbd....

But these kernel adjustments came from IBM, RedHat and others, over the years I would read Performance Tuning Guides by companies who used Linux for different purposes....usually single purpose machines like a RedBox for example.

Here is a link for RedHat as an exmple.
https://access.redhat.com/documentation ... ing_Guide/

[Frost_dk]

[fboe]

Hi Frost and Dynobot

Great tweaks you got. I'm really impressed how much improvement in sound you can make with these tweaks. I have tried them, and that's defently the way to go. The sound is fantastic

And Dynobot, you where asking for hardware tweaks, and I have done some, and I have put them in the forum:
3xpsu, and reclocking the rpi with a serious clock from Newclassd.

I'm still a newbie in Linux, so I'm still learning, and hopefully I can come back with some Linux tweaks in the future

Fboe

[Discovery]

[Frost_dk]

Hi Discovery.

I have modified my config files with Dynobots suggestions, so you should be able to copy the info in my last post

i have added the file paths in the post, so it is easier to import

Please let us know if you can notice an improvement?

Kind regards,

Rune Frost

[s.k.]

Hi ,
Thanks for sharing !

Are those tweaks suitable for the raspberry 2 ?
If yes, is it possible to describe them in a more simple/detail (noobproof ) way ?

regards